| cystitis induced by infection with the lyme disease spirochete, borrelia burgdorferi, in mice. | previous studies have demonstrated that the urinary bladder is a consistent source for isolating the lyme disease spirochete, borrelia burgdorferi, from both experimentally infected and naturally exposed rodents. we examined histopathologic changes in the urinary bladder of different types of rodents experimentally infected with lyme spirochetes, including balb/c mice (mus musculus), nude mice (m. musculus), white-footed mice (peromyscus leucopus), and grasshopper mice (onychomys leucogaster). a ... | 1992 | 1443051 |
| cross-transmission studies with eimeria arizonensis-like oocysts (apicomplexa) in new world rodents of the genera baiomys, neotoma, onychomys, peromyscus, and reithrodontomys (muridae). | cross-transmission experiments were performed using oocysts of an eimeria arizonensis-like coccidian from peromyscus leucopus and peromyscus truei, an e. arizonensis-like coccidian from reithrodontomys fulvescens, eimeria baiomysis and eimeria taylori from baiomys taylori, eimeria albigulae from neotoma albigula, and eimeria onychomysis from onychomys spp., between representatives of the above host genera. the e. arizonensis-like coccidian from r. fulvescens infected reithrodontomys megalotis, r ... | 1992 | 1597781 |
| primary immune responses of selected small mammal species to heterologous erythrocytes. | 1. we surveyed the primary humoral immune responsiveness of six small mammal species (peromyscus leucopus, microtus pinetorum, perognathus hispidus, neotoma floridana, onychomys leucogaster, mus musculus) collected from wild populations in central oklahoma using sheep red blood cells (srbc) as the immunogen and a splenic plaque-forming cell (pfc) assay. 2. individuals within each wild species examined produced antibodies to a single intraperitoneal injection of srbc, however, considerable inters ... | 1991 | 1682088 |
| new host and locality records of coccidia (apicomplexa: eimeriidae) from rodents in the southwestern and western united states. | one hundred forty-seven murid and heteromyid rodents were collected from various sites in the southwestern and western united states (arizona, colorado, new mexico, texas, and utah) and baja california norte, mexico, and their feces were examined for coccidial parasites. of these, 53 (36%) were infected with at least 1 coccidian; 45 of 53 (85%) of the infected rodents harbored only 1 species of coccidian. infected rodents included: 10 of 22 (45%) neotoma albigula, 3 of 11 (27%) neotoma floridana ... | 1991 | 1779282 |
| experimentally induced plague infection in the northern grasshopper mouse (onychomys leucogaster) acquired by consumption of infected prey. | in this study, 20 laboratory reared onychomys leucogaster from a parental population that is naturally exposed to plague were each fed a white mouse that had been inoculated with yersinia pestis. three of the 20 o. leucogaster died, four survived with antibody titers against y. pestis and 13 survived with no titer against y. pestis. in contrast, when 20 o. leucogaster from a plague naive parental population were fed infected prey, seven died and 13 survived with no antibody titer against y. pest ... | 1989 | 2810547 |
| sound localization in a predatory rodent, the northern grasshopper mouse (onychomys leucogaster). | a comparison of the ability of mammals to localize sound revealed that among the animals examined to date, none of the rodents have been able to localize as accurately as the carnivores. because all of these rodents are prey animals, the question arises as to whether their poor localization acuity is a phyletic trait of rodentia or whether it is a trait common to prey species that may be under less selective pressure than predators to localize sound accurately. to answer this question, sound loc ... | 1988 | 3365945 |
| susceptibility to yersinia pestis in the northern grasshopper mouse (onychomys leucogaster). | the laboratory-born progeny from two geographically distant populations of northern grasshopper mice (onychomys leucogaster) were challenged with yersinia pestis to determine their relative susceptibilities to plague. one of the o. leucogaster populations was associated with a known epizootic focus of the disease and was found to be nearly 2,000 times more resistant to mortality than were members of another population from an area historically free of plague. the ecology and omnivorous behavior ... | 1988 | 3373638 |
| effects of hormones and gonadal status on the midventral gland of the grasshopper mouse onychomys leucogaster. | a midventrally located fusiform sebaceous gland is found in the northern grasshopper mouse onychomys leucogaster. microscopically, the gland consists of numerous multilobular units. copious secretory material collects in the central duct of each unit and is extruded to the outside. the gland is larger in the male than in the female. castration causes an involution of the gland in both sexes. testosterone propionate (1.0 mg/0.1 cc olive oil, subcutaneously every other day for 4 weeks) restores th ... | 1985 | 3887990 |
| hearing in two cricetid rodents: wood rat (neotoma floridana) and grasshopper mouse (onychomys leucogaster). | the audiograms of two wood rats and three grasshopper mice were determined with a conditioned avoidance procedure. the wood rats were able to hear tones from 940 hz to 56 khz at a level of 60 db (spl), with their best sensitivity of -3 db occurring at 8 khz. the hearing of the grasshopper mice ranged from 1.85 khz to 69 khz at 60 db (spl), with their best sensitivity of 9 db also occurring at 8 khz. these results support the relation between interaural distance and high-frequency hearing and bet ... | 1985 | 3899497 |
| helminths of sympatric populations of kangaroo rats (dipodomys ordii) and grasshopper mice (onychomys leucogaster) from the high plains of eastern new mexico. | during a 1-yr period 124 dipodomys ordii and 92 onychomys leucogaster were trapped from the same locality and were examined for helminths. only 1 cestode species (catenotaenia linsdalei) was recovered from d. ordii, whereas o. leucogaster was infected with 2 nematoda (litomosoides carinii, mastophorus muris), 2 cestoda (hymenolepis citelli, and 1 unknown), and 1 acanthocephalan (moniliformis clarki) species. all represent new host and distribution records. | 1985 | 4057002 |
| demodex sp. infesting tongue, esophagus, and oral cavity of onychomys leucogaster, the grasshopper mouse. | | 1973 | 4744520 |
| agonistic behavior of the northern grasshopper mouse (onychomys leucogaster breviauritus). | | 1968 | 5691424 |
| sexual behaviour of the northern grasshopper mouse (onychomys leucogaster). | | 1965 | 5882803 |
| photoperiod and melatonin influence seasonal gonadal cycles in the grasshopper mouse (onychomys leucogaster). | development of the reproductive apparatus was delayed in grasshopper mice maintained from birth in short photoperiods (10 h light/day). the inhibitory effects of short photoperiods on sexual maturation eventually waned and mice in 10l:14d became reproductively active. adult mice transferred from long (14 h light/day) to short photoperiods underwent testicular regression after 10 weeks and complete gonadal redevelopment after 30 weeks. a similar phenomenon was observed in adult female mice; oestr ... | 1983 | 6350572 |
| sex differences in shock motivated behaviors, activity, and discrimination learning of northern grasshopper mice (onychomys leucogaster). | sex differences in the behavior of the highly predatory northern grasshopper mouse (onychomys leucogaster) were investigated in a series of eight experiments. female mice acquired two-way avoidance behavior more slowly, but passive avoidance more rapidly, than males. females also buried a shock probe more completely than males and showed more escape behavior during open field testing. there were no sex differences in flinch-jump thresholds or escape from electric shock, general activity levels, ... | 1984 | 6379703 |
| breeding of the northern grasshopper mouse (onychomys leucogaster) as a laboratory animal. | laboratory matings were attempted to establish breeding colonies of northern grasshopper mice, onychomys leucogaster (which were captured in new mexico, u.s.a.), as experimental animals. the results were as follows. the rate of pregnancy was 75% with cohabitation for more than 30 days, and 4% with cohabitation from 1 to 7 days. both cases were of monogamous mating. the mean litter size was 3.5 +/- 1.2, with a range of 1 to 6. the rate of weaning was 78.8%. the mean gestation period was 27.4 +/- ... | 1994 | 7925628 |
| mitochondrial dna phylogeography in northern grasshopper mice (onychomys leucogaster)--the influence of quaternary climatic oscillations on population dispersion and divergence. | the details of mitochondrial dna (mtdna) phylogenetic structure of the northern grasshopper mouse onychomys leucogaster were examined using populations from a postulated area of endemism that includes three arid regions (colorado plateaus, interior plains, and wyoming basins) in western north america. fifteen tetra- and heptanucleotide restriction enzymes were used to assay restriction-site variation in a 2150-bp pcr-amplified fragment of mtdna representing the nd2 and part of the coi gene regio ... | 1993 | 8167852 |
| small mammal survival and trapability in mark-recapture monitoring programs for hantavirus. | following the 1993 hantavirus pulmonary syndrome (hps) epidemic in the south-western united states, mammalogists and epidemiologists instituted long-term studies to monitor population density and prevalence of infection in rodents which constitute the reservoir for sin nombre virus (snv). in this study, field techniques used in sampling small mammals for snv infection were evaluated to determine if trapping and handling protocols were having significant effects on future trapability or mortality ... | 1998 | 9476220 |
| cross-transmission studies with eimeria arizonensis, e. arizonensis-like oocysts and eimeria langebarteli: host specificity at the genus and species level within the muridae. | cross-transmission experiments were done using sporulated oocysts of eimeria arizonensis from peromyscus truei and peromyscus maniculatus, and oocysts of 2 putative species that resemble e. arizonensis, i.e., eimeria albigulae from neotoma albigula, and eimeria onychomysis from onychomys leucogaster. oocysts of each species were inoculated into representatives of p. maniculatus and the latter 2 rodent species. other experiments were conducted wherein oocysts of eimeria langebarteli from peromysc ... | 1999 | 10577723 |
| auditory cues support place navigation in rats when associated with a visual cue. | rats, like other crepuscular animals, have excellent auditory capacities and they discriminate well between different sounds [heffner he, heffner rs, hearing in two cricetid rodents: wood rats (neotoma floridana) and grasshopper mouse (onychomys leucogaster). j comp psychol 1985;99(3):275-88]. however, most experimental literature concerning spatial orientation almost exclusively emphasizes the use of visual landmarks [cressant a, muller ru, poucet b. failure of centrally placed objects to contr ... | 2000 | 11099774 |
| jaw muscle functional anatomy in northern grasshopper mouse, onychomys leucogaster, a carnivorous murid. | the jaw muscle anatomy of the northern grasshopper mouse, onychomys leucogaster, was observed and the mechanical basis of the insectivorous/carnivorous adaptations were examined. compared with peromyscus maniculatus, a granivorous relative of onychomys, there is a reduction of some aponeuroses within the masseter deep layer. this characteristic indicates that shearing meat or crushing arthropod exoskeletons requires less occlusal pressure than does grinding plant material. in onychomys both the ... | 2006 | 16710844 |
| host usage and seasonal activity patterns of ixodes kingi and i. sculptus (acari: ixodidae) nymphs in a colorado prairie landscape, with a summary of published north american host records for all life stages. | we examined host usage and seasonal activity patterns of the nymphal stage of the ticks ixodes kingi and i. sculptus within a prairie rodent community in north-central colorado. ixodes kingi was commonly encountered on both northern grasshopper mice (onychomys leucogaster) and thirteen-lined ground squirrels (spermophilus tridecemlineatus), whereas i. sculptus frequently infested s. tridecemlineatus but was absent from o. leucogaster. low numbers of ticks of both species were collected from deer ... | 2006 | 16859106 |
| acquisition of nonspecific bartonella strains by the northern grasshopper mouse (onychomys leucogaster). | rodent-associated bartonella species are generally host-specific parasites in north america. here evidence that bartonella species can 'jump' between host species is presented. northern grasshopper mice and other rodents were trapped in the western usa. a study of bartonella infection in grasshopper mice demonstrated a high prevalence that varied from 25% to 90% by location. bartonella infection was detected in other rodent species with a high prevalence as well. sequence analyses of glta identi ... | 2007 | 17672850 |
| exposure of small rodents to plague during epizootics in black-tailed prairie dogs. | plague, caused by the bacterium yersinia pestis, causes die-offs of colonies of prairie dogs (cynomys ludovicianus). it has been argued that other small rodents are reservoirs for plague, spreading disease during epizootics and maintaining the pathogen in the absence of prairie dogs; yet there is little empirical support for distinct enzootic and epizootic cycles. between 2004 and 2006, we collected blood from small rodents captured in colonies in northern colorado before, during, and for up to ... | 2008 | 18689662 |
| prevalence of yersinia pestis in rodents and fleas associated with black-tailed prairie dogs (cynomys ludovicianus) at thunder basin national grassland, wyoming. | rodents (and their fleas) that are associated with prairie dogs are considered important for the maintenance and transmission of the bacterium (yersinia pestis) that causes plague. our goal was to identify rodent and flea species that were potentially involved in a plague epizootic in black-tailed prairie dogs at thunder basin national grassland. we collected blood samples and ectoparasites from rodents trapped at off- and on-colony grids at thunder basin national grassland between 2002 and 2004 ... | 2008 | 18689663 |
| geographic variation in rodent-flea relationships in the presence of black-tailed prairie dog colonies. | we characterized the relationship between fleas and their rodent hosts in the presence of prairie dog colonies and compared them to adjacent assemblages away from colonies. we evaluated the rodent-flea relationship by quantifying prevalence, probability of infestation, flea load, and intensity of fleas on rodents. as prairie dog burrows provide refugia for fleas, we hypothesized that prevalence, flea load, and intensity would be higher for rodents that are associated with black-tailed prairie do ... | 2008 | 18697322 |
| a new mite, eubrachylaelaps crowei, from the grasshopper mouse, onychomys leucogaster arcticeps (rhoads). | | 1947 | 18917673 |
| scavenging by mammalian carnivores on prairie dog colonies: implications for the spread of plague. | plague causes mass mortality of prairie dogs (cynomys ludovicianus) in shortgrass steppe. although the pathogen, the bacterium yersinia pestis, is spread within colonies by flea bites or contact between infected hosts, it is unclear how y. pestis is transported over long distances between isolated colonies. one possibility is that wideranging, plague-resistant mammalian carnivores pick up fleas when scavenging prairie dog carcasses. using guinea pigs as surrogates for prairie dogs, we compared h ... | 2009 | 18945188 |
| evidence for the involvement of an alternate rodent host in the dynamics of introduced plague in prairie dogs. | 1. the introduction of plague to north america is a significant threat to colonies of prairie dogs (cynomys ludovicianus), a species of conservation concern in the great plains. other small rodents are exposed to the causative agent, yersinia pestis, during or after epizootics; yet, its effect on these rodents is not known, and their role in transmitting and maintaining plague in the absence of prairie dogs remains unclear. 2. we live-trapped small rodents and collected their fleas on 11 colonie ... | 2009 | 19302321 |
| gape and bite force in the rodents onychomys leucogaster and peromyscus maniculatus: does jaw-muscle anatomy predict performance? | compared with the deer mouse, peromyscus maniculatus, the grasshopper mouse, onychomys leucogaster, exhibits modifications in its jaw-muscle architecture that promote wide gapes and large bite forces at wide gapes to prey upon large vertebrate prey. in this study, we determine whether jaw-muscle anatomy predicts gape and biting performance in o. leucogaster, and we also assess the influence of gape on bite force in the two species. although o. leucogaster has an absolutely longer jaw, which faci ... | 2009 | 19480012 |
| effects of weather and plague-induced die-offs of prairie dogs on the fleas of northern grasshopper mice. | plague, the disease caused by the bacterium yersinia pestis, can have devastating impacts on black-tailed prairie dogs (cynomys ludovicianus ord). other mammal hosts living on prairie dog colonies may be important in the transmission and maintenance of plague. we examined the flea populations of northern grasshopper mice (onychomys leucogaster wied) before, during, and after plague epizootics in northern colorado and studied the influence of host and environmental factors on flea abundance patte ... | 2009 | 19496431 |
| inferring host-parasite relationships using stable isotopes: implications for disease transmission and host specificity. | identifying the roles of different hosts and vectors is a major challenge in the study of the ecology of diseases caused by multi-host pathogens. intensive field studies suggested that grasshopper mice (onychomys leucogaster) help spread the bacterium that causes plague (yersinia pestis) in prairie dog colonies by sharing fleas with prairie dogs (cynomys ludovicianus); yet conclusive evidence that prairie dog fleas (oropsylla hirsuta) feed on grasshopper mice is lacking. using stable nitrogen is ... | 2009 | 19967881 |
| plague outbreaks in prairie dog populations explained by percolation thresholds of alternate host abundance. | highly lethal pathogens (e.g., hantaviruses, hendra virus, anthrax, or plague) pose unique public-health problems, because they seem to periodically flare into outbreaks before disappearing into long quiescent phases. a key element to their possible control and eradication is being able to understand where they persist in the latent phase and how to identify the conditions that result in sporadic epidemics or epizootics. in american grasslands, plague, caused by yersinia pestis, exemplifies this ... | 2010 | 20660742 |
| antibodies to tacaribe serocomplex viruses (family arenaviridae, genus arenavirus) in cricetid rodents from new mexico, texas, and mexico. | blood samples from 4893 cricetid rodents were tested for antibody (immunoglobulin g) to whitewater arroyo virus and amaparí virus to extend our knowledge of the natural host range and geographical distribution of tacaribe serocomplex viruses in north america. antibodies to arenaviruses were found in northern pygmy mice (baiomys taylori), woodrats (neotoma spp.), northern grasshopper mice (onychomys leucogaster), oryzomys (oryzomys spp.), deermice (megadontomys nelsoni and peromyscus spp.), harve ... | 2010 | 20795917 |
| organization of somatosensory cortex in the northern grasshopper mouse (onychomys leucogaster), a predatory rodent. | northern grasshopper mice (onychomys leucogaster) are among the most highly carnivorous rodents in north america. because predatory mammals may have specialization of senses used to detect prey, we investigated the organization of sensory areas within grasshopper mouse neocortex and quantified the number of myelinated axons in grasshopper mouse trigeminal, cochlear, and optic nerves. multiunit electrophysiological recordings combined with analysis of flattened sections of neocortex processed for ... | 2011 | 21120928 |
| polymerase chain reaction (pcr) identification of rodent blood meals confirms host sharing by flea vectors of plague. | elucidating feeding relationships between hosts and parasites remains a significant challenge in studies of the ecology of infectious diseases, especially those involving small or cryptic vectors. black-tailed prairie dogs (cynomys ludovicianus) are a species of conservation importance in the north american great plains whose populations are extirpated by plague, a flea-vectored, bacterial disease. using polymerase chain reaction (pcr) assays, we determined that fleas (oropsylla hirsuta) associa ... | 2010 | 21175944 |
| factors determining the abundance and distribution of rodents in a shrub-steppe ecosystem: the role of shrubs. | this study addressed the relative importances of shrub "resources" on a rodent community in a sagebrush dominated shrub-steppe ecosystem in southwestern wyoming. direct effects of shrubs (i.e., providing rodents with "food and cover") were assessed by removing shrubs from a 1.25 ha study plot and monitoring both rodent populations and their food resources. shrub architecture and shrub-related food resources were found to be unimportant to deermice (peromyscus maniculatus), great basin pocket mic ... | 1983 | 28310227 |
| mites of the subgenus neotomobia n. subg. (acariformes: myobiidae: radfordia), parasites of the subfamily neotominae (rodentia: cricetidae). | a new subgenus neotomobia n. subg. (acariformes: myobiidae: radfordia) is established for species parasitising rodents of the subfamily neotominae (rodentia: cricetidae): radfordia subuliger ewing, 1938 (type-species), radfordia eremici fain & bochkov, 2002, radfordia neotomae jameson & whitaker, 1975 and radfordia hamiltoni jameson & whitaker, 1975. three new species are described: radfordia peromyscus n. sp. from peromyscus megalops merriam from mexico, radfordia onychomys n. sp. from onychomy ... | 2014 | 25204596 |
| demodex leucogasteri n. sp. from onychomys leucogaster - with notes on its biology and host pathogenesis. | | 1981 | 7304117 |
| paracellular nutrient absorption is higher in bats than rodents: integrating from intact animals to the molecular level. | flying vertebrates have been hypothesized to rely heavily on paracellular absorption of nutrients to compensate for having smaller intestines than non-flyers. we tested this hypothesis in an insectivorous bat (myotis lucifugus) and two insect-eating rodents (onychomys leucogaster and peromyscus leucopus). in intact animals, the fractional absorption of orally dosed l-arabinose (mr 150) was 82% in m. lucifugus, which was more than twice that of the rodents. absorption of creatinine (mr 113) was g ... | 2014 | 25063860 |
| wheel-running behavior in 12 species of muroid rodents. | the objective of this research was to describe the levels and periodicity of wheel running in 12 species of muroid rodents in order that comparisons could be made among different measures of activity in a variety of species. six males from each species (peromyscus polionotus, p. eremicus, p. leucopus, p. maniculatus, p. gossypinus, microtus pennysylvanicus, m. montanus, m. canicaudus, m. ochrogaster, calomys callos us, onychomys leucogaster, and mus musculus) were tested in running wheels for 14 ... | 1980 | 24925276 |
| cross-fostering alters advertisement vocalizations of grasshopper mice (onychomys): evidence for the developmental stress hypothesis. | nutritional stress can have lasting impacts on the development of traits involved in vocal production. cross-fostering experiments are often used to examine the propensity for vocal learning in a variety of taxa, but few studies assess the influence of malnourishment that can occur as a byproduct of this technique. in this study, we reciprocally cross-fostered sister taxa of voluble grasshopper mice (genus onychomys) to explore their propensity for vocal learning. vocalizations of onychomys leuc ... | 2016 | 26873411 |
| a new eimeria species (apicomplexa: eimeriidae) infecting onychomys species (rodentia: muridae) in new mexico and arizona. | fecal samples from 3 species of onychomys (rodentia: muridae) captured in new mexico and arizona were examined for coccidia. six of the 59 (10%) were infected with a new species of eimeria. sporulated oocysts (n = 105) of this new species are subspheroidal, 17.4 x 16.1 (14-21 x 13-19) microm, with ellipsoidal sporocysts 10.4 x 5.7 (9-12 x 5-8) microm. this species occurred in 3 of 24 (13%) onychomys arenicola, 2 of 31 (6%) onychomys leucogaster from new mexico, and 1 of 4 (25%) onychomys torridu ... | 1998 | 9920315 |
| brain-body size relations in grasshopper mice. | cranial volumes were measured on museum specimens of two species of grasshopper mice, onychomys leucogaster brevicaudus and onychomys torridus pulcher. these were compared with body weights and body lengths, as recorded on the museum tags. on average, females were heavier and slightly longer than males, but they had smaller cranial volumes by about 3%. statistically, the differences were marginally significant (with no difference in body length for one species), but the pattern of differences wa ... | 2003 | 12907856 |
| aversiveness of denatonium saccharide and quinine in grasshopper mice onychomys leukogaster. | the responses toward denatonium saccharide and quinine by three rodent species differ from those exhibited by humans. this study measured the relative aversiveness of these two compounds in grasshopper mice (onychomys leucogaster) to determine if this species responded similarly to or differently from these other rodents. in a choice test, the mice clearly preferred quinine over denatonium saccharide at concentrations of 1/10,000 and 1/50,000, but only marginally preferred quinine at a concentra ... | 1989 | 2717362 |
| recognition of prey species by their odors in the grasshopper mouse (onychomys leucogaster ). | this study examined the development of olfactory recognition of an insect prey by the northern grasshopper mouse. the approach was to feed different groups of mice a certain amount of house crickets, may beetles or mealworm larvae or varying numbers of house crickets and then measure a mouse's preference for discovering that particular species when presented these three insects buried in a grid pattern. a mouse preferentially sought out that species which it had eaten and required between 5 and ... | 1984 | 24896524 |
| social play behaviours and insect predation in northern grasshopper mice (onychomys leucogaster). | play behaviours of northern grasshopper mice, onychomys leucogaster , were observed from 27 to 61 days of age and after a brief period of social isolation. the mice were also observed during a simple test of cricket predation. with the exception of an active play-soliciting response, the play behaviours were quite similar to those described for other rodents. play declined with increasing age and was strongly potentiated by social isolation. there was no discernable relationship between any of t ... | 1983 | 24897322 |
| preferences by northern grasshopper mice for solutions of sugars, acids, and salts in richter-type drinking tests. | taste preferences, as measured in 48-hour, richter-type drinking tests (test solution opposite distilled water), were determined for northern grasshopper mice (onychomys leucogaster, ssp. breviauritus). the ss were nine males and nine females which were individually housed within an environmental chamber. the test solutions were prepared from five sugars (fructose, glucose, lactose, maltose, sucrose) three salts (magnesium sulfate, potassium chloride, sodium chloride), and two acids (citric acid ... | 1976 | 956793 |
| effect of acth on reproductive organs of immature female northern grasshopper mice (onychomys leucogaster). | | 1974 | 4375717 |
| gestation period and early development in onychomys leucogaster brevicaudus. | | 1968 | 5691425 |
| rodents' responses to manipulated plant litter and seed densities: implications for restoration. | rodent populations in arid grasslands do not always track seed production, possibly due to high levels of plant litter. when natural disturbances are suppressed, litter accumulates becoming physically complex, causing rodents to harvest fewer seeds per equivalent time foraging. it also alters security from predation. restoring natural disturbances may be an important element in conserving rodent communities. the aim of this study was to assess the influence of two levels of plant litter cover an ... | 2020 | 32704449 |
| plague-positive mouse fleas on mice before plague induced die-offs in black-tailed and white-tailed prairie dogs. | plague is a lethal zoonotic disease associated with rodents worldwide. in the western united states, plague outbreaks can decimate prairie dog (cynomys spp.) colonies. however, it is unclear where the causative agent, yersinia pestis, of this flea-borne disease is maintained between outbreaks, and what triggers plague-induced prairie dog die-offs. less susceptible rodent hosts, such as mice, could serve to maintain the bacterium, transport infectious fleas across a colony, or introduce the patho ... | 2019 | 30994405 |
| impact of sylvatic plague vaccine on non-target small rodents in grassland ecosystems. | oral vaccination is an emerging management strategy to reduce the prevalence of high impact infectious diseases within wild animal populations. plague is a flea-borne zoonosis of rodents that often decimates prairie dog (cynomys spp.) colonies in the western usa. recently, an oral sylvatic plague vaccine (spv) was developed to protect prairie dogs from plague and aid recovery of the endangered black-footed ferret (mustela nigripes). although oral vaccination programs are targeted toward specific ... | 2018 | 29744628 |
| vocal divergence is concordant with genomic evidence for strong reproductive isolation in grasshopper mice (onychomys). | behavioral barriers to gene flow often evolve faster than intrinsic incompatibilities and can eliminate the opportunity for hybridization between interfertile species. while acoustic signal divergence is a common driver of premating isolation in birds and insects, its contribution to speciation in mammals is less studied. here we characterize the incidence of, and potential barriers to, hybridization among three closely related species of grasshopper mice (genus onychomys). all three species use ... | 2019 | 31788222 |
| a broad filter between call frequency and peripheral auditory sensitivity in northern grasshopper mice (onychomys leucogaster). | acoustic communication is a fundamental component of mate and competitor recognition in a variety of taxa and requires animals to detect and differentiate among acoustic stimuli (bradbury and vehrencamp in principles of animal communication, 2nd edn., sinauer associates, sunderland, 2011). the matched filter hypothesis predicts a correspondence between peripheral auditory tuning of receivers and properties of species-specific acoustic signals, but few studies have assessed this relationship in r ... | 2019 | 31030219 |